What do you think (of) your vacation?为什么要用of

What do you think What do you think of what do you think about what do you think of what do yu think you What do you think about what do you think i what do you think you do? DO YOU THINK WHAT YOU THINK YOU THINK怎么样 what about=what do you think what do you think?和what are you think about 是“what do you think”还是“how do you think”? what do yu think you arewhat do yu think you what do you think you are doing What do you think you are? what do you think you are like What do you think you're worth? What do you think interest you 改错